chiark / gitweb /
10d08171112e77909d17a8fc9f9718c52af56fba
[stgit] / stgit / commands / common.py
1 """Function/variables common to all the commands
2 """
3
4 __copyright__ = """
5 Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License version 2 as
9 published by the Free Software Foundation.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 """
20
21 import sys, os, os.path, re, email.Utils
22 from stgit.exception import *
23 from stgit.utils import *
24 from stgit.out import *
25 from stgit.run import *
26 from stgit import stack, git, basedir
27 from stgit.config import config, file_extensions
28 from stgit.lib import stack as libstack
29 from stgit.lib import git as libgit
30 from stgit.lib import log
31
32 # Command exception class
33 class CmdException(StgException):
34     pass
35
36 # Utility functions
37 def parse_rev(rev):
38     """Parse a revision specification into its branch:patch parts.
39     """
40     try:
41         branch, patch = rev.split(':', 1)
42     except ValueError:
43         branch = None
44         patch = rev
45
46     return (branch, patch)
47
48 def git_id(crt_series, rev):
49     """Return the GIT id
50     """
51     # TODO: remove this function once all the occurrences were converted
52     # to git_commit()
53     repository = libstack.Repository.default()
54     return git_commit(rev, repository, crt_series.get_name()).sha1
55
56 def git_commit(name, repository, branch_name = None):
57     """Return the a Commit object if 'name' is a patch name or Git commit.
58     The patch names allowed are in the form '<branch>:<patch>' and can
59     be followed by standard symbols used by git rev-parse. If <patch>
60     is '{base}', it represents the bottom of the stack.
61     """
62     # Try a [branch:]patch name first
63     branch, patch = parse_rev(name)
64     if not branch:
65         branch = branch_name or repository.current_branch_name
66
67     # The stack base
68     if patch.startswith('{base}'):
69         base_id = repository.get_stack(branch).base.sha1
70         return repository.rev_parse(base_id +
71                                     strip_prefix('{base}', patch))
72
73     # Other combination of branch and patch
74     try:
75         return repository.rev_parse('patches/%s/%s' % (branch, patch),
76                                     discard_stderr = True)
77     except libgit.RepositoryException:
78         pass
79
80     # Try a Git commit
81     try:
82         return repository.rev_parse(name, discard_stderr = True)
83     except libgit.RepositoryException:
84         raise CmdException('%s: Unknown patch or revision name' % name)
85
86 def check_local_changes():
87     if git.local_changes():
88         raise CmdException('local changes in the tree. Use "refresh" or'
89                            ' "status --reset"')
90
91 def check_head_top_equal(crt_series):
92     if not crt_series.head_top_equal():
93         raise CmdException('HEAD and top are not the same. This can happen'
94                            ' if you modify a branch with git. "stg repair'
95                            ' --help" explains more about what to do next.')
96
97 def check_conflicts():
98     if git.get_conflicts():
99         raise CmdException('Unsolved conflicts. Please resolve them first'
100                            ' or revert the changes with "status --reset"')
101
102 def print_crt_patch(crt_series, branch = None):
103     if not branch:
104         patch = crt_series.get_current()
105     else:
106         patch = stack.Series(branch).get_current()
107
108     if patch:
109         out.info('Now at patch "%s"' % patch)
110     else:
111         out.info('No patches applied')
112
113 def resolved_all(reset = None):
114     conflicts = git.get_conflicts()
115     git.resolved(conflicts, reset)
116
117 def push_patches(crt_series, patches, check_merged = False):
118     """Push multiple patches onto the stack. This function is shared
119     between the push and pull commands
120     """
121     forwarded = crt_series.forward_patches(patches)
122     if forwarded > 1:
123         out.info('Fast-forwarded patches "%s" - "%s"'
124                  % (patches[0], patches[forwarded - 1]))
125     elif forwarded == 1:
126         out.info('Fast-forwarded patch "%s"' % patches[0])
127
128     names = patches[forwarded:]
129
130     # check for patches merged upstream
131     if names and check_merged:
132         out.start('Checking for patches merged upstream')
133
134         merged = crt_series.merged_patches(names)
135
136         out.done('%d found' % len(merged))
137     else:
138         merged = []
139
140     for p in names:
141         out.start('Pushing patch "%s"' % p)
142
143         if p in merged:
144             crt_series.push_empty_patch(p)
145             out.done('merged upstream')
146         else:
147             modified = crt_series.push_patch(p)
148
149             if crt_series.empty_patch(p):
150                 out.done('empty patch')
151             elif modified:
152                 out.done('modified')
153             else:
154                 out.done()
155
156 def pop_patches(crt_series, patches, keep = False):
157     """Pop the patches in the list from the stack. It is assumed that
158     the patches are listed in the stack reverse order.
159     """
160     if len(patches) == 0:
161         out.info('Nothing to push/pop')
162     else:
163         p = patches[-1]
164         if len(patches) == 1:
165             out.start('Popping patch "%s"' % p)
166         else:
167             out.start('Popping patches "%s" - "%s"' % (patches[0], p))
168         crt_series.pop_patch(p, keep)
169         out.done()
170
171 def parse_patches(patch_args, patch_list, boundary = 0, ordered = False):
172     """Parse patch_args list for patch names in patch_list and return
173     a list. The names can be individual patches and/or in the
174     patch1..patch2 format.
175     """
176     # in case it receives a tuple
177     patch_list = list(patch_list)
178     patches = []
179
180     for name in patch_args:
181         pair = name.split('..')
182         for p in pair:
183             if p and not p in patch_list:
184                 raise CmdException, 'Unknown patch name: %s' % p
185
186         if len(pair) == 1:
187             # single patch name
188             pl = pair
189         elif len(pair) == 2:
190             # patch range [p1]..[p2]
191             # inclusive boundary
192             if pair[0]:
193                 first = patch_list.index(pair[0])
194             else:
195                 first = -1
196             # exclusive boundary
197             if pair[1]:
198                 last = patch_list.index(pair[1]) + 1
199             else:
200                 last = -1
201
202             # only cross the boundary if explicitly asked
203             if not boundary:
204                 boundary = len(patch_list)
205             if first < 0:
206                 if last <= boundary:
207                     first = 0
208                 else:
209                     first = boundary
210             if last < 0:
211                 if first < boundary:
212                     last = boundary
213                 else:
214                     last = len(patch_list)
215
216             if last > first:
217                 pl = patch_list[first:last]
218             else:
219                 pl = patch_list[(last - 1):(first + 1)]
220                 pl.reverse()
221         else:
222             raise CmdException, 'Malformed patch name: %s' % name
223
224         for p in pl:
225             if p in patches:
226                 raise CmdException, 'Duplicate patch name: %s' % p
227
228         patches += pl
229
230     if ordered:
231         patches = [p for p in patch_list if p in patches]
232
233     return patches
234
235 def name_email(address):
236     p = email.Utils.parseaddr(address)
237     if p[1]:
238         return p
239     else:
240         raise CmdException('Incorrect "name <email>"/"email (name)" string: %s'
241                            % address)
242
243 def name_email_date(address):
244     p = parse_name_email_date(address)
245     if p:
246         return p
247     else:
248         raise CmdException('Incorrect "name <email> date" string: %s' % address)
249
250 def address_or_alias(addr_pair):
251     """Return a name-email tuple the e-mail address is valid or look up
252     the aliases in the config files.
253     """
254     addr = addr_pair[1]
255     if '@' in addr:
256         # it's an e-mail address
257         return addr_pair
258     alias = config.get('mail.alias.' + addr)
259     if alias:
260         # it's an alias
261         return name_email(alias)
262     raise CmdException, 'unknown e-mail alias: %s' % addr
263
264 def prepare_rebase(crt_series):
265     # pop all patches
266     applied = crt_series.get_applied()
267     if len(applied) > 0:
268         out.start('Popping all applied patches')
269         crt_series.pop_patch(applied[0])
270         out.done()
271     return applied
272
273 def rebase(crt_series, target):
274     try:
275         tree_id = git_id(crt_series, target)
276     except:
277         # it might be that we use a custom rebase command with its own
278         # target type
279         tree_id = target
280     if tree_id == git.get_head():
281         out.info('Already at "%s", no need for rebasing.' % target)
282         return
283     if target:
284         out.start('Rebasing to "%s"' % target)
285     else:
286         out.start('Rebasing to the default target')
287     git.rebase(tree_id = tree_id)
288     out.done()
289
290 def post_rebase(crt_series, applied, nopush, merged):
291     # memorize that we rebased to here
292     crt_series._set_field('orig-base', git.get_head())
293     # push the patches back
294     if not nopush:
295         push_patches(crt_series, applied, merged)
296
297 #
298 # Patch description/e-mail/diff parsing
299 #
300 def __end_descr(line):
301     return re.match('---\s*$', line) or re.match('diff -', line) or \
302             re.match('Index: ', line)
303
304 def __split_descr_diff(string):
305     """Return the description and the diff from the given string
306     """
307     descr = diff = ''
308     top = True
309
310     for line in string.split('\n'):
311         if top:
312             if not __end_descr(line):
313                 descr += line + '\n'
314                 continue
315             else:
316                 top = False
317         diff += line + '\n'
318
319     return (descr.rstrip(), diff)
320
321 def __parse_description(descr):
322     """Parse the patch description and return the new description and
323     author information (if any).
324     """
325     subject = body = ''
326     authname = authemail = authdate = None
327
328     descr_lines = [line.rstrip() for line in  descr.split('\n')]
329     if not descr_lines:
330         raise CmdException, "Empty patch description"
331
332     lasthdr = 0
333     end = len(descr_lines)
334
335     # Parse the patch header
336     for pos in range(0, end):
337         if not descr_lines[pos]:
338            continue
339         # check for a "From|Author:" line
340         if re.match('\s*(?:from|author):\s+', descr_lines[pos], re.I):
341             auth = re.findall('^.*?:\s+(.*)$', descr_lines[pos])[0]
342             authname, authemail = name_email(auth)
343             lasthdr = pos + 1
344             continue
345         # check for a "Date:" line
346         if re.match('\s*date:\s+', descr_lines[pos], re.I):
347             authdate = re.findall('^.*?:\s+(.*)$', descr_lines[pos])[0]
348             lasthdr = pos + 1
349             continue
350         if subject:
351             break
352         # get the subject
353         subject = descr_lines[pos]
354         lasthdr = pos + 1
355
356     # get the body
357     if lasthdr < end:
358         body = reduce(lambda x, y: x + '\n' + y, descr_lines[lasthdr:], '')
359
360     return (subject + body, authname, authemail, authdate)
361
362 def parse_mail(msg):
363     """Parse the message object and return (description, authname,
364     authemail, authdate, diff)
365     """
366     from email.Header import decode_header, make_header
367
368     def __decode_header(header):
369         """Decode a qp-encoded e-mail header as per rfc2047"""
370         try:
371             words_enc = decode_header(header)
372             hobj = make_header(words_enc)
373         except Exception, ex:
374             raise CmdException, 'header decoding error: %s' % str(ex)
375         return unicode(hobj).encode('utf-8')
376
377     # parse the headers
378     if msg.has_key('from'):
379         authname, authemail = name_email(__decode_header(msg['from']))
380     else:
381         authname = authemail = None
382
383     # '\n\t' can be found on multi-line headers
384     descr = __decode_header(msg['subject']).replace('\n\t', ' ')
385     authdate = msg['date']
386
387     # remove the '[*PATCH*]' expression in the subject
388     if descr:
389         descr = re.findall('^(\[.*?[Pp][Aa][Tt][Cc][Hh].*?\])?\s*(.*)$',
390                            descr)[0][1]
391     else:
392         raise CmdException, 'Subject: line not found'
393
394     # the rest of the message
395     msg_text = ''
396     for part in msg.walk():
397         if part.get_content_type() == 'text/plain':
398             msg_text += part.get_payload(decode = True)
399
400     rem_descr, diff = __split_descr_diff(msg_text)
401     if rem_descr:
402         descr += '\n\n' + rem_descr
403
404     # parse the description for author information
405     descr, descr_authname, descr_authemail, descr_authdate = \
406            __parse_description(descr)
407     if descr_authname:
408         authname = descr_authname
409     if descr_authemail:
410         authemail = descr_authemail
411     if descr_authdate:
412        authdate = descr_authdate
413
414     return (descr, authname, authemail, authdate, diff)
415
416 def parse_patch(text, contains_diff):
417     """Parse the input text and return (description, authname,
418     authemail, authdate, diff)
419     """
420     if contains_diff:
421         (text, diff) = __split_descr_diff(text)
422     else:
423         diff = None
424     (descr, authname, authemail, authdate) = __parse_description(text)
425
426     # we don't yet have an agreed place for the creation date.
427     # Just return None
428     return (descr, authname, authemail, authdate, diff)
429
430 def readonly_constant_property(f):
431     """Decorator that converts a function that computes a value to an
432     attribute that returns the value. The value is computed only once,
433     the first time it is accessed."""
434     def new_f(self):
435         n = '__' + f.__name__
436         if not hasattr(self, n):
437             setattr(self, n, f(self))
438         return getattr(self, n)
439     return property(new_f)
440
441 class DirectoryException(StgException):
442     pass
443
444 class _Directory(object):
445     def __init__(self, needs_current_series = True, log = True):
446         self.needs_current_series =  needs_current_series
447         self.log = log
448     @readonly_constant_property
449     def git_dir(self):
450         try:
451             return Run('git', 'rev-parse', '--git-dir'
452                        ).discard_stderr().output_one_line()
453         except RunException:
454             raise DirectoryException('No git repository found')
455     @readonly_constant_property
456     def __topdir_path(self):
457         try:
458             lines = Run('git', 'rev-parse', '--show-cdup'
459                         ).discard_stderr().output_lines()
460             if len(lines) == 0:
461                 return '.'
462             elif len(lines) == 1:
463                 return lines[0]
464             else:
465                 raise RunException('Too much output')
466         except RunException:
467             raise DirectoryException('No git repository found')
468     @readonly_constant_property
469     def is_inside_git_dir(self):
470         return { 'true': True, 'false': False
471                  }[Run('git', 'rev-parse', '--is-inside-git-dir'
472                        ).output_one_line()]
473     @readonly_constant_property
474     def is_inside_worktree(self):
475         return { 'true': True, 'false': False
476                  }[Run('git', 'rev-parse', '--is-inside-work-tree'
477                        ).output_one_line()]
478     def cd_to_topdir(self):
479         os.chdir(self.__topdir_path)
480     def write_log(self, msg):
481         if self.log:
482             log.compat_log_entry(msg)
483
484 class DirectoryAnywhere(_Directory):
485     def setup(self):
486         pass
487
488 class DirectoryHasRepository(_Directory):
489     def setup(self):
490         self.git_dir # might throw an exception
491         log.compat_log_external_mods()
492
493 class DirectoryInWorktree(DirectoryHasRepository):
494     def setup(self):
495         DirectoryHasRepository.setup(self)
496         if not self.is_inside_worktree:
497             raise DirectoryException('Not inside a git worktree')
498
499 class DirectoryGotoToplevel(DirectoryInWorktree):
500     def setup(self):
501         DirectoryInWorktree.setup(self)
502         self.cd_to_topdir()
503
504 class DirectoryHasRepositoryLib(_Directory):
505     """For commands that use the new infrastructure in stgit.lib.*."""
506     def __init__(self):
507         self.needs_current_series = False
508         self.log = False # stgit.lib.transaction handles logging
509     def setup(self):
510         # This will throw an exception if we don't have a repository.
511         self.repository = libstack.Repository.default()